Volume 40, Number 2, October II 1997
|Page(s)||153 - 158|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Microscopic dynamics in liquid deuterium: A transition from collective to single-particle regimes
Instituto de Estructura de la Materia, Consejo Superior de
Serrano 123, E-28006 Madrid, Spain
2 Département de Recherche Fondamentale sur la Matière Condensée, SPSMS/MDN, CEA Grenoble, 38054 Grenoble, France
3 Rutherford Appleton Laboratory, Chilton, Didcot Oxon, OX11 0QX, UK
Accepted: 9 September 1997
Well-defined (propagating) collective density fluctuations are found for liquid deuterium up to large wave vectors at SVP conditions. Their phase velocities as well as the wave vector dependence of the excitation linewidths and strengths indicate that what is experimentally observed is dominated by a continuation to large wave vectors of hydrodynamic (sound-mode) excitations. For wave vectors , the spectrum approaches that of a weakly interacting fluid. A transition to a regime dominated by single-particle (recoil and quantized rotation) motions is found to occur within , depending upon thermodynamic conditions.
PACS: 62.10.+s – Mechanical properties of liquids / 62.60.+v – Acoustical properties of liquids
© EDP Sciences, 1997
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